PIC12LF1501 datasheet(249/352 Pages) MICROCHIP

249 / 352 page

 2011-2015 Microchip Technology Inc.

DS40001607D-page 249

PIC16(L)F1503

26.0

IN-CIRCUIT SERIAL

PROGRAMMING™ (ICSP™)

ICSP™ programming allows customers to manufacture

circuit boards with unprogrammed devices. Programming

can be done after the assembly process allowing the

device to be programmed with the most recent firmware

or a custom firmware. Five pins are needed for ICSP™

programming:

• ICSPCLK

• ICSPDAT

•MCLR/VPP

•VDD

•VSS

In Program/Verify mode the program memory, user IDs

and the Configuration Words are programmed through

serial communications. The ICSPDAT pin is a bidirec-

tional I/O used for transferring the serial data and the

ICSPCLK pin is the clock input. For more information on

ICSP™ refer to the “PIC12(L)F1501/PIC16(L)F150X

Memory Programming Specification

” (DS41573).

26.1

High-Voltage Programming Entry

Mode

The device is placed into High-Voltage Programming

Entry mode by holding the ICSPCLK and ICSPDAT

pins low then raising the voltage on MCLR/VPP to VIHH.

26.2

Low-Voltage Programming Entry

Mode

The Low-Voltage Programming Entry mode allows the

PIC® Flash MCUs to be programmed using VDD only,

without high voltage. When the LVP bit of Configuration

Words is set to ‘1’, the ICSP Low-Voltage Programming

Entry mode is enabled. To disable the Low-Voltage

ICSP mode, the LVP bit must be programmed to ‘0’.

Entry into the Low-Voltage Programming Entry mode

requires the following steps:

MCLR is brought to VIL.

A 32-bit key sequence is presented on

ICSPDAT, while clocking ICSPCLK.

Once the key sequence is complete, MCLR must be

held at VIL for as long as Program/Verify mode is to be

maintained.

If low-voltage programming is enabled (LVP = 1), the

MCLR Reset function is automatically enabled and

cannot be disabled. See Section 6.5 “MCLR” for more

information.

The LVP bit can only be reprogrammed to ‘0’ by using

the High-Voltage Programming mode.

26.3

Common Programming Interfaces

Connection to a target device is typically done through

an ICSP™ header. A commonly found connector on

development tools is the RJ-11 in the 6P6C (6-pin,

6-connector) configuration. See Figure 26-1.

FIGURE 26-1:

ICD RJ-11 STYLE

CONNECTOR INTERFACE

Another connector often found in use with the PICkit™

programmers is a standard 6-pin header with 0.1 inch

spacing. Refer to Figure 26-2.

Target

Bottom Side

PC Board

VPP/MCLR

VSS

ICSPCLK

VDD

ICSPDAT

Pin Description*

1 = VPP/MCLR

2 = VDD Target

3 = VSS (ground)

4 = ICSPDAT

5 = ICSPCLK

6 = No Connect

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